Ballet dancer with unknown pain at hip

[neurospast]

MRI is clear of hipjoint I assume. A popping sound is audible and afterwards the movement is full range.
-Take a look at the syndesmosis of the pubis, MRI? Is the pelvis well aligned? (popping)
-Does patient complain about backpain? (might refer to joint from level T11-L1)
-Is the patient hyper mobile? (instability of pelvis/spine)
-What about Tensor facia lata? (can give a popping feeling and pain on lateral side of thigh, test by e.g. knee flex/ext)
Since your patient is a ballet dancer and female the likelyhood of an instability is great. Pelvis instability can easily be tested and X-rayed (before popping!)
good luck